I have a 95 850 GLT wagon with a mysterious oil leak that the repair shop cannot fix. And this is a Volvo/Saab specialist, one of the more reputable places in the region.
We've made four trips to the shop over the past three months. They've had the car for a total of five days. Every time they think they have the problem solved. The leak goes away for a few days, but then comes back. First, they replaced the camshaft position sensor seal. A few weeks later, they serviced the PCV system and cleaned the flame trap. A few weeks after that they serviced the PCV system again and cleaned the throttle body assembly. About a month later, they resealed the rear cover plate and the rear of the cylinder head. Then about a month after that, they replaced the PCV screen, the PCV nipple, the PCV nipple O-ring, the balance shaft seal, and the chemical gasket sealant. They also checked the camshaft and everything seems to be OK. This last time, the leak went away for about two weeks, but now is back again.
Does anyone have a clue what could be causing this?